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Sensor Operating Range Charts

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Temperature: °F (°C) Ohms
32 (0)
TBI 5880
SFI 5210-6730
68 (20) 2210-2690
104 (40) 1140
140 (60) 580
176 (80) 290-350
EGR TEMPERATURE (EGRT) SENSOR RESISTANCE (1)

Temperature: °F (°C) Ohms
68 (20) 214,000-313,800
104 (40) 90,900-125,700
140 (60) 42,100-55,500
176 (80) 21,100-26,500
212 (100) 11,200-13,600
(1) Used on California models and 1.6L.
INTAKE AIR TEMPERATURE (IAT) SENSOR RESISTANCE

Temperature: °F (°C) Ohms
32 (0) 5400-6600
68 (20) 2280-2870
104 (40) 1060-1360
140 (60) 530-700
176 (80) 290-390
212 (100) 160-230
CAUTION: Damage to MAP sensor will occur if connections are made incorrectly.
MAP SENSOR OUTPUT VOLTAGE

Altitude (Feet) Vacuum (In. Hg) (1)(2) Volts
0 30 3.4-3.8
1000 29 3.3-3.7
2000 28 3.1-3.6
3000 27 3.0-3.5
4000 26 2.9-3.3
5000 25 2.8-3.2
6000 24 2.7-3.1
7000 23 2.6-3.0
8000 22 2.5-2.9
9000 21 2.4-2.8
10,000 20 2.3-2.7
(1) Voltage should reduce when up to 15 in. Hg of vacuum is applied to MAP sensor.
(2) MAP sensor output voltage is tested with three 1.5-volt batteries connected in series (output 4.5-5.0 volts). Positive lead of batteries is connected to VIN terminal Negative lead of batteries is connected to ground terminal. Check output voltage between VOUT terminal and ground.
MAP SENSOR OUTPUT VOLTAGE

Altitude (Feet) Vacuum (In. Hg) (1)(2) Volts
0 30 3.6-4.4
1000 29 3.5-4.2
2000 28 3.4-4.1
3000 27 3.2-4.0
4000 26 3.1-3.8
5000 25 3.0-3.7
6000 24 2.9-3.6
7000 23 2.8-3.4
8000 22 2.7-3.3
9000 21 2.6-3.2
10,000 20 2.5-3.1
(1) MAP sensor output voltage is tested with coupler connected to ECM. ECM is located on upper left corner of instrument panel. Before testing MAP sensor output voltage, ensure ECM supply voltage is 4.75-5.25 volts at connector terminal A23 (Gray/Red wire) and terminal A24 (Gray/Yellow wire).
(2) Output voltage is checked at ECM connector terminal A22 (Gray/Green wire) and terminal A24 (Gray/Yellow wire). Start engine, if possible, and see if output voltage varies.
CAUTION: Blowing compressed air through mass airflow sensor will damage it.
MASS AIRFLOW (MAF) SENSOR VOLTAGE TEST (1)(2)

Application ECM Terminal Volts
Ign. On, Eng. Off B8 & Ground 1.0-1.6
Engine Idle Speed B8 & Ground 1.7-2.0
(1) Voltage should increase as engine speed increases.
(2) Ignition on, confirm battery voltage between B+ of MAF coupler and ground.
POWER STEERING PRESSURE SIGNAL VSV

Application Ohms
All Models (1) .33-.39
(1) Measure between power steering VSV terminals.
THROTTLE POSITION (TP) SENSOR RESISTANCE

Application Ohms
SFI
Between Terminals No. 1 & 2
With .020" (.51 mm) Clearance At Stop Screw 0-500
With .031" (.79 mm) Clearance At Stop Screw Infinity
Between Terminals No. 1 & 3
At Idle (2) 300-2000
At Wide Open Throttle (2) 2000-6500
Between Terminals No. 1 & 4 3500-6500
TBI
Between Terminals No. 1 & 4
With .012" (.30 mm) Clearance At Stop Screw 0-500
With .022" (.56 mm) Clearance At Stop Screw Infinity
Between Terminals No. 2 & 4 3500-6500
Between Terminals No. 4 & 5
At Idle (2) 300-2000
At Wide Open Throttle (1)(2) 2000-6500
(1) To obtain idle position, apply 19 in. Hg vacuum to throttle opener.
(2) There should be more than 2000 ohms difference between idle and wide open throttle resistance.
VEHICLE SPEED SENSOR (VSS) RESISTANCE

Application Ohms
All Models (1)
(1) With ohmmeter connected to vehicle speed sensor terminals, ohmmeter should alternate between zero and infinity 4 times per sensor shaft revolution.
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